The XC17128EPD8C is a high-performance One-Time Programmable (OTP) serial configuration PROM manufactured by Xilinx (now AMD). This essential component is specifically designed to store and deliver configuration data to Xilinx FPGA devices during power-up sequences. With its 128Kbit memory capacity and reliable 8-pin PDIP package, the XC17128EPD8C has become a trusted solution for embedded system designers and electronics engineers worldwide.
XC17128EPD8C Product Overview
The XC17128EPD8C belongs to the XC17000 family of serial configuration PROMs. These devices play a critical role in FPGA-based systems by providing non-volatile storage for configuration bitstreams. When power is applied to the system, the XC17128EPD8C automatically loads the stored configuration data into the target FPGA, ensuring fast and reliable startup every time.
Why Choose the XC17128EPD8C?
This configuration PROM offers several advantages for designers seeking a dependable solution:
- Automatic Configuration: Seamlessly configures FPGAs at power-up without processor intervention
- Non-Volatile Storage: Retains configuration data even when power is removed
- Compact Package: 8-pin PDIP package saves valuable PCB space
- Commercial Grade Reliability: Operates flawlessly across standard temperature ranges
XC17128EPD8C Technical Specifications
Understanding the detailed specifications of the XC17128EPD8C helps engineers make informed design decisions. The following tables provide comprehensive technical data.
General Specifications
| Parameter |
Value |
| Manufacturer |
Xilinx (AMD) |
| Part Number |
XC17128EPD8C |
| Product Category |
Configuration PROM |
| Memory Type |
One-Time Programmable (OTP) |
| Memory Density |
128 Kbit (131,072 bits) |
| Memory Organization |
16,384 × 8 |
| Interface Type |
Serial |
| RoHS Status |
Compliant |
Electrical Characteristics
| Parameter |
Minimum |
Typical |
Maximum |
Unit |
| Supply Voltage (VCC) |
4.5 |
5.0 |
5.5 |
V |
| Input High Voltage (VIH) |
2.0 |
– |
VCC + 0.5 |
V |
| Input Low Voltage (VIL) |
-0.5 |
– |
0.8 |
V |
| Output High Voltage (VOH) |
2.4 |
– |
– |
V |
| Output Low Voltage (VOL) |
– |
– |
0.4 |
V |
| Supply Current (Active) |
– |
10 |
20 |
mA |
| Standby Current |
– |
100 |
500 |
µA |
Operating Conditions
| Parameter |
Specification |
| Operating Temperature Range |
0°C to +70°C (Commercial) |
| Storage Temperature Range |
-65°C to +150°C |
| Humidity (Non-Condensing) |
5% to 95% RH |
| Data Retention |
20 years minimum |
Package Information
| Parameter |
Specification |
| Package Type |
PDIP (Plastic Dual In-Line Package) |
| Pin Count |
8 |
| Package Code |
PD8 |
| Mounting Type |
Through-Hole |
| Lead Pitch |
2.54 mm (0.1 inch) |
| Package Dimensions |
9.27 × 6.35 × 3.30 mm |
XC17128EPD8C Pin Configuration
The 8-pin PDIP package provides a straightforward interface for PCB integration. Below is the complete pinout description.
| Pin Number |
Pin Name |
I/O Type |
Description |
| 1 |
DATA |
Output |
Serial data output to FPGA |
| 2 |
CE |
Input |
Chip Enable (active low) |
| 3 |
CEO |
Output |
Chip Enable Output for daisy-chaining |
| 4 |
GND |
Power |
Ground connection |
| 5 |
CLK |
Input |
Serial clock input |
| 6 |
RESET/OE |
Input |
Reset and Output Enable |
| 7 |
NC |
– |
No Connection |
| 8 |
VCC |
Power |
Power supply (+5V) |
XC17128EPD8C Features and Benefits
High-Density Configuration Storage
The XC17128EPD8C provides 128Kbit of configuration memory, which is sufficient for programming smaller Xilinx FPGA devices. This density supports various FPGA families including legacy XC3000 and XC4000 series devices. For larger FPGAs requiring more configuration data, multiple XC17128EPD8C devices can be daisy-chained using the CEO (Chip Enable Output) pin.
Reliable One-Time Programmable Technology
As an OTP device, the XC17128EPD8C uses antifuse technology to permanently store configuration data. This approach offers several benefits over reprogrammable alternatives:
- Enhanced Security: Configuration data cannot be altered or copied
- Superior Reliability: No risk of accidental erasure or corruption
- Extended Data Retention: Guaranteed 20-year minimum data retention
- Cost-Effective: Lower cost compared to flash-based alternatives for production
Seamless Serial Interface
The serial interface simplifies PCB routing by minimizing the number of connections required between the PROM and FPGA. The XC17128EPD8C uses a simple 3-wire interface consisting of CLK, DATA, and control signals. This streamlined connectivity reduces PCB complexity and improves signal integrity.
Industry-Standard Package
The 8-pin PDIP package is an industry-standard through-hole format that offers excellent handling characteristics during assembly. This package is particularly suitable for prototyping and low-volume production where through-hole components are preferred.
XC17128EPD8C Applications
The XC17128EPD8C finds widespread use across numerous industries and applications:
Industrial Control Systems
In industrial automation, the XC17128EPD8C provides reliable FPGA configuration for programmable logic controllers (PLCs), motor drives, and process control equipment. The commercial temperature rating ensures stable operation in factory environments.
Telecommunications Equipment
Network switches, routers, and communication modules utilize the XC17128EPD8C for fast FPGA initialization. The quick configuration time minimizes system boot delays, which is essential for maintaining network uptime.
Consumer Electronics
Television set-top boxes, gaming peripherals, and audio/video processing equipment incorporate the XC17128EPD8C to configure FPGAs that handle multimedia processing tasks.
Test and Measurement Instruments
Oscilloscopes, signal generators, and data acquisition systems rely on the XC17128EPD8C to configure FPGAs that perform high-speed signal processing and analysis.
Aerospace and Defense (Prototyping)
While the commercial-grade XC17128EPD8C is not suitable for flight-qualified applications, it serves effectively in ground-based test equipment and prototype development systems.
XC17128EPD8C Programming Requirements
Programming Equipment
The XC17128EPD8C requires specialized programming hardware for bitstream loading. Compatible programmers include:
| Programmer |
Manufacturer |
Notes |
| HW-130 |
Xilinx |
Legacy PROM Programmer |
| SUPERPRO Series |
Xeltek |
Universal Device Programmer |
| BPM Microsystems |
BPM |
Production Programming Systems |
| Data I/O |
Data I/O |
High-Volume Production |
Programming Voltage Requirements
| Parameter |
Value |
| VCC (Programming) |
5.0V ± 5% |
| VPP (Programming Voltage) |
12.5V ± 0.5V |
| Programming Time |
< 60 seconds |
| Verify Margin |
±5% VCC |
XC17128EPD8C Design Considerations
Power Supply Decoupling
Proper power supply decoupling is essential for reliable operation. Place a 0.1µF ceramic capacitor as close as possible to pin 8 (VCC) and pin 4 (GND). Additionally, include a 10µF electrolytic capacitor on the power rail for bulk filtering.
PCB Layout Guidelines
- Keep clock traces short and away from noise sources
- Maintain controlled impedance for high-speed signals
- Provide adequate ground plane coverage beneath the device
- Use proper ESD protection on all I/O pins
Configuration Timing
The XC17128EPD8C supports clock frequencies up to 10MHz for configuration. At maximum clock speed, the complete 128Kbit configuration transfers in approximately 13 milliseconds, enabling rapid system initialization.
XC17128EPD8C Ordering Information
| Part Number |
Memory Size |
Package |
Temperature Range |
RoHS |
| XC17128EPD8C |
128 Kbit |
8-PDIP |
0°C to +70°C (Commercial) |
Yes |
| XC17128EPD8I |
128 Kbit |
8-PDIP |
-40°C to +85°C (Industrial) |
Yes |
| XC17128EPC8C |
128 Kbit |
8-PLCC |
0°C to +70°C (Commercial) |
Yes |
XC17128EPD8C vs. Alternative Configuration Solutions
When selecting a configuration memory solution, engineers should consider several factors. The following comparison helps identify the optimal choice.
| Feature |
XC17128EPD8C (OTP) |
Flash PROM |
External SPI Flash |
| Reprogrammability |
No |
Yes |
Yes |
| Security Level |
High |
Medium |
Low |
| Cost (Unit) |
Low |
Medium |
Very Low |
| Configuration Speed |
Fast |
Fast |
Variable |
| Daisy-Chain Support |
Yes |
Yes |
Limited |
| Board Space |
Minimal |
Minimal |
Minimal |
| Data Retention |
20+ years |
10+ years |
10+ years |
Frequently Asked Questions About XC17128EPD8C
What FPGAs are compatible with the XC17128EPD8C?
The XC17128EPD8C is compatible with Xilinx FPGAs that support serial slave configuration mode. This includes devices from the XC3000, XC4000, Spartan, and early Virtex families. Always verify configuration memory requirements against your specific FPGA datasheet.
Can I reprogram the XC17128EPD8C?
No, the XC17128EPD8C is a One-Time Programmable (OTP) device. Once programmed, the configuration data is permanently stored and cannot be modified. For applications requiring field updates, consider flash-based alternatives like the XCF series.
How many XC17128EPD8C devices can be daisy-chained?
Multiple devices can be daisy-chained by connecting the CEO pin of one device to the CE pin of the next. Theoretically, there is no hard limit, but practical considerations include configuration time and PCB routing complexity.
What is the shelf life of an unprogrammed XC17128EPD8C?
Unprogrammed XC17128EPD8C devices have an indefinite shelf life when stored properly in their original moisture-barrier packaging. Once opened, devices should be programmed within the timeframe specified by IPC/JEDEC J-STD-033.
Conclusion
The XC17128EPD8C remains a reliable and cost-effective solution for serial configuration of Xilinx FPGAs. Its combination of 128Kbit density, OTP security, and simple 8-pin PDIP package makes it ideal for industrial, telecommunications, and consumer electronics applications. Whether you are developing a new product or maintaining legacy systems, the XC17128EPD8C delivers the dependable performance that FPGA-based designs require.
For engineers working with Xilinx programmable logic devices, understanding the capabilities and specifications of configuration memory components like the XC17128EPD8C is essential for successful system design.
